Video encoding method and video decoding method

Abstract

A video encoding method using a plurality of reference pictures includes: selecting whether or not a resilient picture referencing scheme is to be used for encoding video; writing a parameter indicating the selection into a header of an encoded video bitstream; and encoding a picture using inter-picture prediction using a result of the selection.

The invention claimed is: 
     
       1. A video decoding method for decoding a bitstream of an encoded video including pictures using one or more reference pictures, the video decoding method comprising:
 judging whether or not each of the pictures is a key picture having a temporal level that is lower than a temporal level of the current picture; 
 constructing a reference picture list including a valid reference picture for a current picture; and 
 decoding the current picture by performing prediction using the valid reference picture included in the reference picture list, 
 wherein when the current picture is a first picture of a switched temporal level higher than a temporal level of the key picture, all of reference pictures included in a reference picture memory are key pictures. 
 
     
     
       2. A video decoding apparatus which decodes a bitstream of an encoded video including pictures using one or more reference pictures, the video decoding apparatus comprising:
 a judging unit configured to judge whether or not each of the pictures is a key picture having a temporal level that is lower than a temporal level of the current picture; 
 a constructing unit configured to construct a reference picture list including a valid reference picture for a current picture; and 
 a decoding unit configured to decode the current picture by performing prediction using the valid reference picture included in the reference picture list, 
 wherein when the current picture is a first picture of a switched temporal level higher than a temporal level of the key picture, all of reference pictures included in a reference picture memory are key pictures.